Les deux aveugles is an 1855 one-act French bouffonerie musicale (operetta) by Jacques Offenbach. The libretto was written by Jules Moinaux and was a condensation of his 3-act Les musiciens ambulants.

Cox and Box; or, The Long-Lost Brothers, is a one-act comic opera with a libretto by F. C. Burnand and music by Arthur Sullivan, based on the 1847 farce Box and Cox by John Maddison Morton. It was Sullivan's first successful comic opera. The story concerns a landlord who lets a room to two lodgers, one who works at night and one who works during the day. When one of them has the day off, they meet each other in the room and tempers flare. Sullivan wrote this piece five years before his first opera with W. S. Gilbert, Thespis.